[PATCH v9 4/5] hw/arm/arm_gicv3_kvm: Add a migration blocker with kvm nested virt

[Eric Auger <eric.auger@redhat.com>]

We may be miss some NV related GIC register save/restore. Until
we complete the study, let's add a migration blocker when the
maintenance IRQ is set.

Signed-off-by: Eric Auger <eric.auger@redhat.com>
Suggested-by: Peter Maydell <peter.maydell@linaro.org>
---
 hw/intc/arm_gicv3_kvm.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/hw/intc/arm_gicv3_kvm.c b/hw/intc/arm_gicv3_kvm.c
index b30aac7aee..fccb3886bf 100644
--- a/hw/intc/arm_gicv3_kvm.c
+++ b/hw/intc/arm_gicv3_kvm.c
@@ -827,8 +827,16 @@ static void kvm_arm_gicv3_realize(DeviceState *dev, Error **errp)
     }
 
     if (s->maint_irq) {
+        Error *kvm_nv_migration_blocker = NULL;
         int ret;
 
+        error_setg(&kvm_nv_migration_blocker,
+                       "Live migration disabled due to KVM nested virt enabled");
+        if (migrate_add_blocker(&kvm_nv_migration_blocker, errp)) {
+            error_free(kvm_nv_migration_blocker);
+            return;
+        }
+
         ret = kvm_device_check_attr(s->dev_fd,
                                     KVM_DEV_ARM_VGIC_GRP_MAINT_IRQ, 0);
         if (!ret) {
-- 
2.49.0